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[ANSYS Meshing] Problems with creating a hex-uniform MultiZone Mash with Inflation

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Old   December 11, 2016, 15:45
Post Problems with creating a hex-uniform MultiZone Mash with Inflation
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Anna Feichtner
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Hello everybody
This is my first post and I'm reasonably new to CFD and Ansys (CFX)...

I want to simulate external flow around a single object/building with different shapes/geometries. When the object was a cube with vertical walls the meshing worked out easy and also the rest of the simulation was succesfull. I'm doing it with Ansys Meshing, because in the moment I don't intend to learn ICEM.

Now my "cube" has skew walls - it's a parallelepiped - and I have problems with meshing and get different Error-messages. Maybe you have advice or ideas for solving my problem?

I want only Hex-cells and an Inflation on the object-surfaces and I want to vary the angle of slope of the walls furthermore. At one single time I was succesfull with creating the mesh with the following setup (see pics):
- MultiZone method -> Hexa, uniform, free mesh type not allowed, source: the cube surfaces
- edge sizing of the cube edges with bias
- Inflation -> first layer thickness 0,5mm , 35 max layers, growth rate 1,2
- angle of slope of walls: 15
- no slicing of the main body

But it's not able to create a mesh, when I
1. slice the body into blocks (with connecting it to one part) AND/OR
2. increase the angle of slope of the walls over 25
Somehow the Inflation is a problem for meshing? Error-message: "MultiZone meshing failed during O-grid creation for inflation. Please check the inflation settings."
And maybe the reasonable sharp edge with increasing angle of slope on the top of the building is a problem for the Inflation? Error-Message: "MultiZone meshing failed during creation of 3D blocking. The MultiZone mesh method has manual source faces selected. The other faces are generally treated as side faces, but not all of these faces could be mapped meshed. Further decomposition of the following faces may help, or please allow Free Mesh Type."

I tried a few things out, but unfortunately without success
Help would be very kind and appreciated
Attached Images
File Type: jpg 15degrees_NotSliced.jpg (198.9 KB, 82 views)
File Type: jpg 15degrees_NotSliced2.jpg (141.3 KB, 86 views)
File Type: jpg sliced.JPG (42.1 KB, 63 views)
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Old   December 13, 2016, 14:48
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Anna Feichtner
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I'm wondering wheter this is a stupid question?
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Old   April 18, 2019, 11:40
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Siva Chaitanya
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Quote:
Originally Posted by AnnaF View Post
I'm wondering wheter this is a stupid question?
Hey,

I know i am reviving an old thread but did you find a solution for this problem ?

I have the same error popping up all the time when i try to create inflation for my rectangular body in a domain. Any input would be much appreciated.
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Old   April 18, 2019, 22:25
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Anna Feichtner
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Hi Siva

unfortunately, I haven't found a solution. Please see attached the mesh I have used in the end... not very satisfying though.

Anna
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Old   April 19, 2019, 07:24
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Baris PULAT
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I don't think you need to use inflation option for a case like this.
A way is to slice the geometry (blocking) so that you can give a mesh sizing.
After blocking you can play with the geometry as you wish.
Anyway i made a demonstration. Checkout the images.
There is only body sizing and multizone for all bodies in the mesh settings.
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File Type: png 2.png (36.4 KB, 48 views)
File Type: png 3.png (82.6 KB, 49 views)
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